Osaka Castle Research Institute Inc.

Established Jōguchi Research Institute (representative: Genzō Jōguchi) in Genjō-cho, Shiba-ku, Tokyo, and began contracting design and construction of purification equipment, Taisho toilets, and other water and sanitation facilities.

Established Osaka branch of Jōguchi Research Institute at 57-1 Sonezaki-cho, Kita-ku, Osaka, headed by branch manager Kamekichi Jōguchi, and began contracting water, sanitation, heating, ventilation, and related pipework.

Opened Kyoto branch office at 210-1 Shimobori-cho, Higashiyama-ku, Kyoto.

Opened Kobe branch office and relocated to 6-2-8 Shimoyamete-dori, Chuo-ku, Kobe during the Showa 20 war disaster.

Organizational change to Jōguchi Research Institute Inc.

Renamed Osaka branch to Osaka Jōguchi Research Institute Inc. (representative: Kamekichi Jōguchi) after full capital contribution of 1 million yen.

Fire destroyed the office during the war; relocated to 1 Takagaki-cho, Kita-ku, Osaka.

Jōguchi Yōhei appointed as CEO.

Promoted Kyoto branch office to Kyoto branch.

Changed residential address to head office at 2-15 Kakuda-cho, Kita-ku, Osaka.

Constructed new head office building "Shiroguchi Building" at current location.

Increased capital to 60 million yen with full payment.

Established Shiroguchi Service Co., Ltd. with capital of 10 million yen.

Constructed new Kyoto branch office building at current location (Kyoto City awarded "Office building harmonized with Kyoto’s streetscape").

Promoted Kobe branch office to Kobe branch.

Shunobu Jōguchi appointed as President and CEO.

Moved the Kobe branch to 2-2-3 Isobedori, Chuo-ku, Kobe City

Celebrating the 100th anniversary: established a commemorative symbol mark and brand statement